Invisible Setting for Precious Stones

Abstract

An item of jewelry (1) consisting of a central stone (2) and several peripheral stones (3) arranged on a support (4). Said support (4) comprises a first ring (5) concentric with and connected to a second ring (6) smaller in diameter and greater in height than the first ring (5). The second ring (6) comes to a T-shaped shoulder (8) on its top edge with one side designed to be snapped into a longitudinal groove (9) passing all the way around the circumference of the pavilion (10) of the central stone (2) and its other side is snapped into a groove (11) present in one of the facets near the edge of each peripheral stone (3). The peripheral stones are held firmly in their positions by a slot (12) formed on the inside of the perimeter of the first ring (5).

Description

An embodiment of the invention will now be described as an example, no limitation being in any way implied, with reference to the diagrammatic figures, in which:

FIG. 1 is a perspective view of an item of jewelry;

FIG. 2 is a bottom view of the item of jewelry;

FIG. 3 is a top view of the item of jewelry;

FIG. 4 is a cross section through the item of jewelry taken on A-B as marked in FIG. 3;

FIG. 5 a is a top view of the central stone;

FIG. 5 b is a side view of the central stone;

FIG. 6 a is a top view of one of the peripheral stones;

FIG. 6 b is a side view of FIG. 6a;

FIG. 6 c is a side view of FIG. 6a; and

FIG. 7 shows an ordinary precious stone labeled with the usual terms employed in jewelry.

In this embodiment of the present invention, an item of jewelry (1) consists of an octagonal diamond (2) and eight small trapezoidal diamonds (3). These diamonds are held securely together by a special support (4).

Said support (4) consists of a first ring (5) concentric with a second ring (6) smaller in diameter and greater in height than the first ring (5). The two rings (5, 6) are connected at their bases by a number of converging arms (7) arranged at regular intervals. The second ring (6) comes to a T-shaped shoulder (8) on its top edge. One of the sides of the shoulder (8) is designed to be snapped into a longitudinal groove (9) passing all the way around the circumference of the pavilion (10) of the octagonal diamond (2). The other side of the shoulder (8) is snapped into a groove (11) present in one of the facets near the edge of each small diamond (3). The latter diamond is held firmly in its position by a slot (12) formed on the inside of the perimeter of the first ring (5). The placement of each of the small diamonds (3) next to each other around the perimeter of the central stone (2) held by the support (4) reproduces the continuous crown of a brilliant-cut diamond.

Said eight small diamonds (3) have been cut in such a way that the length of the edge of one of their sides is identical to the length of the edge of one of the facets (14) on the crown of the octagonal diamond (2).

The height and diameter of the first ring (5) have been predetermined to create an angle of incidence of the table (13) of each of the eight small diamonds (3) equal to that of one of the facets (14) of the crown of the octagonal diamond (2).

Said facet of the crown of the octagonal diamond (2) is placed adjacent to one of the edges of the table (13) of the small diamond (3) in such a way as to reconstruct the bezel facet (15) of a brilliant-cut diamond. The placement of the two facets reconstructing said bezel facet (15) in the same plane results in a continuous fire.

This setting system turns a genuine small 16/16-cut diamond into a larger brilliant-cut diamond when observed from above, yet uses around one tenth of the raw material necessary to create a genuine diamond of this type.

In this embodiment, the perimeter of the cylinder (5) is continuous and opaque, thereby masking the mounting system, while the cylinder (6) may have discontinuities.

The embodiment is in no way restrictive. Instead of the embodiment described above, therefore, the diamonds may be replaced by any other type of precious or semiprecious stone to create items of jewelry having varying esthetic appearances.

The item of jewelry (1) may be mounted on a ring or pendant.

The invention is not limited to rings. Rather, it is applicable to all sorts of items of jewelry such as earrings, necklaces and bracelets.

The invention also relates to a decorative item comprising the item of jewelry of the present invention.

Claims

1. An item of jewelry (1) consisting of a central stone (2) and several peripheral stones (3), characterized in that said stones are arranged on a support (4) comprising a first ring (5) concentric with and connected to a second ring (6) smaller in diameter and greater in height than the first ring (5), said second ring (6) coming to a T-shaped shoulder (8) on its top edge with one side designed to be snapped into a longitudinal groove (9) passing all the way around the circumference of the pavilion (10) of the central stone (2) and its other side snapped into a groove (11) present in each peripheral stone (3), each peripheral stone also being held firmly in its position by a slot (12) formed on the inside of the perimeter of the second ring (6).

2. The item of jewelry (1) as claimed in claim 1, characterized in that the table (13) of each peripheral stone (3) and one of the facets (13) of the crown (4) of the octagonal central stone (2) have an identical angle of incidence.

3. The item of jewelry (1) as claimed in claim 1, characterized in that the length of the edge of one of the sides of each of said peripheral stones (3) is identical to the length of the edge of one of the facets (4) on the crown of the central stone (2).

4. The item of jewelry (1) as claimed in claim 1, characterized in that the central stone (2) is an octagonal stone with eight trapezoidal stones arranged around it.

5. The item of jewelry as claimed in claim 1 in the form of a ring, pendant, earrings, or necklaces.

6. A decorative item comprising an item of jewelry as claimed in claim 1.

7. The item of jewelry (1) as claimed in claim 2, characterized in that the length of the edge of one of the sides of each of said peripheral stones (3) is identical to the length of the edge of one of the facets (4) on the crown of the central stone (2).

8. The item of jewelry (1) as claimed in claim 2, characterized in that the central stone (2) is an octagonal stone with eight trapezoidal stones arranged around it.

9. The item of jewelry (1) as claimed in claim 3, characterized in that the central stone (2) is an octagonal stone with eight trapezoidal stones arranged around it.

10. The item of jewelry as claimed in claim 2 in the form of a ring, pendant, earrings, or necklaces.

11. The item of jewelry as claimed in claim 3 in the form of a ring, pendant, earrings, or necklaces.

12. The item of jewelry as claimed in claim 4 in the form of a ring, pendant, earrings, or necklaces.

13. A decorative item comprising an item of jewelry as claimed in claim 2.

14. A decorative item comprising an item of jewelry as claimed in claim 3.

15. A decorative item comprising an item of jewelry as claimed in claim 4.

16. A decorative item comprising an item of jewelry as claimed in claim 5.